Size and Shape of Sample Units in Native Forests and Plantations
Size and Shape of Sample Units in Native Forests and Plantations作者机构：Department of Forest Science University Federal of Amazonas Manaus Brazil Department of Forest Science University Federal of Paraná Curitiba Brazil Department of Professional and Technological Education University Federal of Paraná Curitiba Brazil
出 版 物：《Open Journal of Forestry》 (林学期刊（英文）)
年 卷 期：2014年第4卷第4期
页 面：379-389页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Optimization of the Size of Plots Sampling of Fixed Area Efficiency per Day of Work Mixed Tropical Forest
摘 要：The size and form of sampling units-SU have always been variables considered in planning and structuring forest inventories, being performed in forests or in plantations. The experimental work outlined to deal with the problem was conducted in an area of araucaria forest, in Sao Joao de Triunfo, PR, Brazil. The forms of sampling units circle, square and rectangular were evaluated, whose areas ranged from 200 m2 to 1000 m2. Time was recorded using a stopwatch and computed separately for locomotion and measurement. The power model was used to adjust the relations of the times of locomotion and measurement, as well as a hyperbolic one for the coefficient of variation, all taking as function of the SUs sizes. To achieve the analytical solution for the optimum size of the SU, it was necessary simulating the behavior of the three functions until the size of 10,000 m2. By taking the derivative of the combined function it was found the maximum point, which allowed optimizing the size of the SU in 600 m2 for the structured experimental conditions. This result proved the formulated hypothesis, performing even a critical analysis of the inclusion of other relevant variables, such as size of the area to be inventoried, number of SUs performed in one day of work, average distance between the SUs, average speeds for locomotion between SUs and for taking all respective measurements.
维普期刊数据库